I'm the worst at sending text messages to a girl

The girl I've been seeing texted me a bit today and then she sent this:

"Yeah Send me a message when you want to come here and have some fun "

I have no idea how to respond, and that was like 3 hours ago :/

I posted in some relationship chats asking for help but no one was around so I thought what the hell I'll just give it a try here. So pretty much we were texting and then I just stopped responding after she sent me that because I have no idea what to say without sounding like an idiot.